The l5awm 300blk magazine has been specifically engineered for use with heavy subsonic.300 blackout ammunition, particularly with 200+ grain projectiles.The updated internal magazine geometry allows these longer heavier bullets to stack properly, which increases feeding reliability when compared to a traditional.223/5.56 magazine.The outside of the mag body is molded with distinctive.300 blackout markings and the magazine ships with a contrasting flat dark earth floor plate for easy visual identification.Caliber: 300 BlackoutCapacity: 20rdModel: L5AWMMaterial: PolymerCapacity: 20